US3663680A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of moulding shaped articles with hollow walls
Assignee: Individual
•
Filing: 1969-09-30
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Granted: 1972-05-16
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Expires: 1989-09-30
Abstract
Abstract The method disclosed is one in which a hollow-walled article, such as a boat, is formed by sintering plastic material in a mould to form substantially spaced inner and outer walls having the desired thickness and thereafter moving the walls relatively toward each other to form connections at desired points while the plastic material is still hot, soft and adhesive so that completely firm and solid connections are formed.
Inventors
- 👤 Lars Ringdal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:30
CPC Classifications
B; B63; B63B; B63B5/00; B63B5/24; B29; B29C; B29C41/00; B29C41/02; B29C41/025; B29C41/04; B29C41/06; B29L; B29L2022/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |